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LEARN MORE ABOUT .idIn 2021, the largest age group in the City of Onkaparinga was 35 to 39 year olds. The group that changed the most since 1991 was 60 to 64 year olds, increasing by 3,800 people.
The Age Structure of the City of Onkaparinga provides key insights into the level of demand for age based services and facilities such as child care. It is also an indicator of the City of Onkaparinga's residential role and function and how it is likely to change in the future.
Five year age groups present a classic age profile of the population. Each age group covers exactly five years, which enables direct comparison between each group.
To get a more complete picture the City of Onkaparinga's Age Structure should be viewed in conjunction with Household Types and Dwelling Types.
Q:
Derived from the Census question:
'What is the person's date of birth or age?'
| Age structure - Five year age groups | |||||||
|---|---|---|---|---|---|---|---|
| City of Onkaparinga - Total females (Enumerated) | 2021 | 1991 | Change | ||||
| Five year age groups (years) | Number | % | Happy Valley % | Number | % | Happy Valley % | 1991 to 2021 |
| 0 to 4 | 4,576 | 5.2 | 5.5 | 5,136 | 8.0 | 9.2 | -561 |
| 5 to 9 | 5,246 | 5.9 | 5.1 | 5,752 | 8.9 | 11.0 | -506 |
| 10 to 14 | 5,172 | 5.9 | 5.7 | 5,607 | 8.7 | 10.6 | -436 |
| 15 to 19 | 4,961 | 5.6 | 5.7 | 5,086 | 7.9 | 7.1 | -125 |
| 20 to 24 | 4,725 | 5.4 | 4.8 | 4,228 | 6.6 | 4.7 | +496 |
| 25 to 29 | 5,164 | 5.8 | 5.3 | 5,085 | 7.9 | 8.1 | +79 |
| 30 to 34 | 5,543 | 6.3 | 6.8 | 5,984 | 9.3 | 11.2 | -442 |
| 35 to 39 | 6,001 | 6.8 | 6.7 | 6,170 | 9.6 | 12.8 | -170 |
| 40 to 44 | 5,628 | 6.4 | 6.4 | 6,009 | 9.3 | 10.8 | -382 |
| 45 to 49 | 5,533 | 6.3 | 5.9 | 3,644 | 5.7 | 3.9 | +1,888 |
| 50 to 54 | 5,906 | 6.7 | 6.0 | 2,554 | 4.0 | 2.2 | +3,351 |
| 55 to 59 | 5,705 | 6.5 | 5.8 | 1,964 | 3.1 | 2.0 | +3,740 |
| 60 to 64 | 5,765 | 6.5 | 6.8 | 1,964 | 3.1 | 1.6 | +3,800 |
| 65 to 69 | 5,327 | 6.0 | 6.8 | 1,841 | 2.9 | 2.1 | +3,485 |
| 70 to 74 | 5,122 | 5.8 | 6.4 | 1,449 | 2.3 | 1.6 | +3,672 |
| 75 to 79 | 3,424 | 3.9 | 4.0 | 1,062 | 1.7 | 0.8 | +2,361 |
| 80 to 84 | 2,170 | 2.5 | 3.0 | 482 | 0.7 | 0.4 | +1,688 |
| 85 and over | 2,328 | 2.6 | 3.5 | 256 | 0.4 | 0.1 | +2,072 |
| Total population | 88,296 | 100.0 | 100.0 | 64,284 | 100.0 | 100.0 | +24,012 |
Dominant groups
Analysis of the female five year age groups of the City of Onkaparinga in 2021 compared to Happy Valley shows that there was a higher proportion of females in the younger age groups (under 15) and a lower proportion of females in the older age groups (65+).
Overall, 17.0% of the female population was aged between 0 and 15, and 20.8% were aged 65 years and over, compared with 16.3% and 23.7% respectively for Happy Valley.
The major differences between the female age structure of the City of Onkaparinga and Happy Valley were:
- A larger percentage of females aged 5 to 9 (5.9% compared to 5.1%)
- A larger percentage of females aged 50 to 54 (6.7% compared to 6.0%)
- A smaller percentage of females aged 85 and over (2.6% compared to 3.5%)
- A smaller percentage of females aged 65 to 69 (6.0% compared to 6.8%)
Emerging groups
From 1991 to 2021, City of Onkaparinga's female population increased by 24,012 people (37.4%). This represents an average annual population change of 1.06% per year over the period.
The largest changes in female age structure in this area between 1991 and 2021 were in the age groups:
- 60 to 64 (+3,800 females)
- 55 to 59 (+3,740 females)
- 70 to 74 (+3,672 females)
- 65 to 69 (+3,485 females)
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